public Task <decimal> CalculateTaxAsync(Item item, int count)
{
var subtotal = item.Price * count;
decimal tax = 0;
if (!item.IsExemptFromBasicSalesTax)
{
tax += RoundHelper.RoundToNearest(subtotal * this.salesTax, TaxRoundsUpTo);
}
if (item.IsImported)
{
tax += RoundHelper.RoundToNearest(subtotal * this.importTax, TaxRoundsUpTo);
}
return(Task.FromResult(subtotal + tax));
}
public void Round_WhenRoundingToNegative_Throws()
{
Assert.Throws <InvalidOperationException>(() => RoundHelper.RoundToNearest(10, -3));
}
public void Round_WhenUsingIntegerRounding_RoundsUpToNearestValue(decimal value, decimal roundTo, decimal expected)
{
var result = RoundHelper.RoundToNearest(value, roundTo);
Assert.Equal(expected, result);
}
